1  /*
       2   * Check decoding of fchmod syscall.
       3   *
       4   * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
       5   * Copyright (c) 2016 Dmitry V. Levin <ldv@strace.io>
       6   * Copyright (c) 2016-2022 The strace developers.
       7   * All rights reserved.
       8   *
       9   * SPDX-License-Identifier: GPL-2.0-or-later
      10   */
      11  
      12  #include "tests.h"
      13  #include "scno.h"
      14  
      15  #ifdef __NR_fchmod
      16  
      17  # include <fcntl.h>
      18  # include <stdio.h>
      19  # include <unistd.h>
      20  
      21  # include "secontext.h"
      22  
      23  int
      24  main(void)
      25  {
      26  	/*
      27  	 * Make sure the current workdir of the tracee
      28  	 * is different from the current workdir of the tracer.
      29  	 */
      30  	create_and_enter_subdir("fchmod_subdir");
      31  
      32  	char *my_secontext = SECONTEXT_PID_MY();
      33  
      34  	static const char sample[] = "fchmod_sample_file";
      35  	(void) unlink(sample);
      36  	int fd = open(sample, O_CREAT|O_RDONLY, 0400);
      37  	if (fd == -1)
      38  		perror_msg_and_fail("open(\"%s\")", sample);
      39  
      40  	static const char sample_del[] = "fchmod_sample_file (deleted)";
      41  	(void) unlink(sample_del);
      42  	int fd_del = open(sample_del, O_CREAT|O_RDONLY, 0400);
      43  	if (fd_del == -1)
      44  		perror_msg_and_fail("open(\"%s\")", sample);
      45  
      46  # ifdef YFLAG
      47  	char *sample_realpath = get_fd_path(fd);
      48  	char *sample_del_realpath = get_fd_path(fd_del);
      49  # endif
      50  
      51  	const char *sample_secontext = SECONTEXT_FILE(sample);
      52  	long rc = syscall(__NR_fchmod, fd, 0600);
      53  # ifdef YFLAG
      54  	printf("%s%s(%d<%s>%s, 0600) = %s\n",
      55  # else
      56  	printf("%s%s(%d%s, 0600) = %s\n",
      57  # endif
      58  	       my_secontext, "fchmod",
      59  	       fd,
      60  # ifdef YFLAG
      61  	       sample_realpath,
      62  # endif
      63  	       sample_secontext,
      64  	       sprintrc(rc));
      65  
      66  	const char *sample_del_secontext = SECONTEXT_FILE(sample_del);
      67  	rc = syscall(__NR_fchmod, fd_del, 0600);
      68  # ifdef YFLAG
      69  	printf("%s%s(%d<%s>%s, 0600) = %s\n",
      70  # else
      71  	printf("%s%s(%d%s, 0600) = %s\n",
      72  # endif
      73  	       my_secontext, "fchmod",
      74  	       fd_del,
      75  # ifdef YFLAG
      76  	       sample_del_realpath,
      77  # endif
      78  	       sample_del_secontext,
      79  	       sprintrc(rc));
      80  
      81  	if (unlink(sample))
      82  		perror_msg_and_fail("unlink(\"%s\")", sample);
      83  
      84  	rc = syscall(__NR_fchmod, fd, 051);
      85  # ifdef YFLAG
      86  	printf("%s%s(%d<%s>(deleted)%s, 051) = %s\n",
      87  # else
      88  	printf("%s%s(%d%s, 051) = %s\n",
      89  # endif
      90  	       my_secontext, "fchmod",
      91  	       fd,
      92  # ifdef YFLAG
      93  	       sample_realpath,
      94  # endif
      95  	       sample_secontext,
      96  	       sprintrc(rc));
      97  
      98  	if (unlink(sample_del))
      99  		perror_msg_and_fail("unlink(\"%s\")", sample_del);
     100  
     101  	rc = syscall(__NR_fchmod, fd_del, 051);
     102  # ifdef YFLAG
     103  	printf("%s%s(%d<%s>(deleted)%s, 051) = %s\n",
     104  # else
     105  	printf("%s%s(%d%s, 051) = %s\n",
     106  # endif
     107  	       my_secontext, "fchmod",
     108  	       fd_del,
     109  # ifdef YFLAG
     110  	       sample_del_realpath,
     111  # endif
     112  	       sample_del_secontext,
     113  	       sprintrc(rc));
     114  
     115  	rc = syscall(__NR_fchmod, fd, 004);
     116  # ifdef YFLAG
     117  	printf("%s%s(%d<%s>(deleted)%s, 004) = %s\n",
     118  # else
     119  	printf("%s%s(%d%s, 004) = %s\n",
     120  # endif
     121  	       my_secontext, "fchmod",
     122  	       fd,
     123  # ifdef YFLAG
     124  	       sample_realpath,
     125  # endif
     126  	       sample_secontext,
     127  	       sprintrc(rc));
     128  
     129  	leave_and_remove_subdir();
     130  
     131  	puts("+++ exited with 0 +++");
     132  	return 0;
     133  }
     134  
     135  #else
     136  
     137  SKIP_MAIN_UNDEFINED("__NR_fchmod")
     138  
     139  #endif